My one impulse buy has been a condy I bought a few weeks ago at Petco ( captive propogated and healthy ). It's been doing well in my tank and has stayed in the same general area. So far the only victims have been a few kenya tree's but I dont mind as there were too many. I'm wondering, though, how aggressive they are and what corals can hold their own against them. If I see they are too risky for the rest of my corals, I'll have to find it a new home.